I very much like the black uniforms except for one detail. The use of a "matte" or "flat" black eliminates any sense of surface detail, contour , or shadow. It might've looked a little better with a deep charcoal instead.
If it's me and the old Kirk wallpaper you're addressing and not the other talented folks who have instituted the awesome black TOS uniforms onto the screengrabs...you're right, of course. Pure laziness on my part.

I had simply blacked out the suit Shatner was wearing and given him a turtleneck type collar line in preparation to add a uniform.
I was looking at it and thought...eh, the black is pretty cool.
Close enough for Rock and Roll.
I might mess with it some more if someone can suggest a source for cool high res and appropriate uniform images.
-Rabittooth